低渗透油藏毛管压力曲线特征分析及应用

我国低渗透油田的储量在探明未动用的地质储量中占有较大的比例。深入研究该类储层的孔隙结构特征对低渗透油层的渗流机理研究及对低渗透油田的合理开发具有重要实际指导意义。通过对低渗透油藏毛管压力曲线的定性特征和定量特征参数分析,发现该类油藏毛管压力曲线符合双曲线变化规律,引用油田压汞法所测得的毛管压力数据,对毛管压力曲线进行双曲线拟合,得到了良好的效果以及有关储层孔隙结构的特征参数。由此可知,低渗透储层具有pd和pc50高、r50小等特点。

ANYLYSIS OF CHARACTERISTICS OF CAPILLARY PRES-SURE CURVES FROM LOW-PERMEABILITY OIL RESER-VOIRS AND APPLICATION OF THE METHOD

Oil reserve in the low-permeability reservoirs acounts for a large percentage of the known but intact reserves. In-depth study of the pore structure characteristics of such reservoirs can shed guidance on the study of fluid flow mechanism and on de-velopment planning for these reservoirs. On the basis of analyses of the qualitative character and quatitative parameters of capil-lary pressure curves from selected samples, it is found that the capillary pressure curve from low-permeability reservoir can be discribed with a hyperbola. Using measured capillary pressure data, the capillary pressure curves are presented with a set of hyperbola. With this method, accurate mathematical calculation of some important parameters of capillary pressure curves for such reservoirs is made poosible.